The successful development of stiff supramolecular gels is an important goal toward their practical application. One approach to stiffen supramolecular gels is to introduce covalent cross‐links. The bis‐urea dimer 2, having a structure similar to that of the low‐molecular‐weight gelator 1, was synthesized. Supramolecular hydrogels were formed from mixtures of 1 and 2 in appropriate ratios, with 2 acting as a covalent cross‐linker to connect the fibrous aggregates formed by the self‐assembly of 1. The introduction of these covalent cross‐links greatly influenced the dynamic viscoelasticity of the supramolecular hydrogels. In the supramolecular hydrogel of 1 mixed with 5 % 2, the storage modulus was 1.35 times higher than that of the supramolecular hydrogel of 1 alone, and the crossover strain was extended from 5 % to over 20 %. The supramolecular hydrogel of 1 and 2 was free‐standing and supported 13 times its own weight.

中文翻译：

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双脲二聚体的合成及其对两亲性三脲超分子水凝胶的物理性质的影响

硬质超分子凝胶的成功开发是其实际应用的重要目标。加强超分子凝胶的一种方法是引入共价交联。合成了具有与低分子量胶凝剂1相似结构的双脲二聚体2。超分子水凝胶从混合物形成的1和2以适当的比例，以2充当共价交联剂连接通过自组装形成的纤维集合体1。这些共价交联的引入极大地影响了超分子水凝胶的动态粘弹性。在1的超分子水凝胶中与5％2混合时，储能模量是1的超分子水凝胶的储能模量的1.35倍，并且交叉应变从5％扩展到20％以上。1和2的超分子水凝胶是独立的，并支撑其自身重量的13倍。